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binutils-gdb/gdb/ia64-linux-tdep.c
Simon Marchi a2e3cce344 gdb/solib: C++ify solib_ops 
Convert solib_ops into an abstract base class (with abstract methods,
some of them with default implementations) and convert all the existing
solib_ops instances to solib_ops derived classes / implementations.

Prior to this patch, solib_ops is a structure holding function pointers,
of which there are only a handful of global instances (in the
`solib-*.c` files).  When passing an `solib_ops *` around, it's a
pointer to one of these instances.  After this patch, there are no more
global solib_ops instances.  Instances are created as needed and stored
in struct program_space.  These instances could eventually be made to
contain the program space-specific data, which is currently kept in
per-program space registries (I have some pending patches for that).

Prior to this patch, `gdbarch_so_ops` is a gdbarch method that returns a
pointer to the appropriate solib_ops implementation for the gdbarch.
This is replaced with the `gdbarch_make_solib_ops` method, which returns
a new instance of the appropriate solib_ops implementation for this
gdbarch.  This requires introducing some factory functions for the
various solib_ops implementation, to be used as `gdbarch_make_solib_ops`
callbacks.  For instance:

    solib_ops_up
    make_linux_ilp32_svr4_solib_ops ()
    {
      return std::make_unique<linux_ilp32_svr4_solib_ops> ();
    }

The previous code is full of cases of tdep files copying some base
solib_ops implementation, and overriding one or more function pointer
(see ppc_linux_init_abi, for instance).  I tried to convert all of this
is a class hierarchy.  I like that it's now possible to get a good
static view of all the existing solib_ops variants.  The hierarchy looks
like this:

    solib_ops
    ├── aix_solib_ops
    ├── darwin_solib_ops
    ├── dsbt_solib_ops
    ├── frv_solib_ops
    ├── rocm_solib_ops
    ├── svr4_solib_ops
    │   ├── ilp32_svr4_solib_ops
    │   ├── lp64_svr4_solib_ops
    │   ├── linux_ilp32_svr4_solib_ops
    │   │   ├── mips_linux_ilp32_svr4_solib_ops
    │   │   └── ppc_linux_ilp32_svr4_solib_ops
    │   ├── linux_lp64_svr4_solib_ops
    │   │   └── mips_linux_lp64_svr4_solib_ops
    │   ├── mips_nbsd_ilp32_svr4_solib_ops
    │   ├── mips_nbsd_lp64_svr4_solib_ops
    │   ├── mips_fbsd_ilp32_svr4_solib_ops
    │   └── mips_fbsd_lp64_svr4_solib_ops
    └── target_solib_ops
        └── windows_solib_ops

The solib-svr4 code has per-arch specialization to provide a
link_map_offsets, containing the offsets of the interesting fields in
`struct link_map` on that particular architecture.  Prior to this patch,
arches would set a callback returning the appropriate link_map_offsets
by calling `set_solib_svr4_fetch_link_map_offsets`, which also happened
to set the gdbarch's so_ops to `&svr_so_ops`.  I converted this to an
abstract virtual method of `struct svr4_solib_ops`, meaning that all
classes deriving from svr4_solib_ops must provide a method returning the
appropriate link_map_offsets for the architecture.  I renamed
`set_solib_svr4_fetch_link_map_offsets` to `set_solib_svr4_ops`.  This
function is still necessary because it also calls
set_gdbarch_iterate_over_objfiles_in_search_order, but if it was not for
that, we could get rid of it.

There is an instance of CRTP in mips-linux-tdep.c, because both
mips_linux_ilp32_svr4_solib_ops and mips_linux_lp64_svr4_solib_ops need
to derive from different SVR4 base classes (linux_ilp32_svr4_solib_ops
and linux_lp64_svr4_solib_ops), but they both want to override the
in_dynsym_resolve_code method with the same implementation.

The solib_ops::supports_namespaces method is new: the support for
namespaces was previously predicated by the presence or absence of a
find_solib_ns method.  It now needs to be explicit.

There is a new progspace::release_solib_ops method, which is only needed
for rocm_solib_ops.  For the moment, rocm_solib_ops replaces and wraps
the existing svr4_solib_ops instance, in order to combine the results of
the two.  The plan is to have a subsequent patch to allow program spaces to have
multiple solib_ops, removing the need for release_solib_ops.

Speaking of rocm_solib_ops: it previously overrode only a few methods by
copying svr4_solib_ops and overwriting some function pointers.  Now, it
needs to implement all the methods that svr4_solib_ops implements, in
order to forward the call.  Otherwise, the default solib_ops method
would be called, hiding the svr4_solib_ops implementation.  Again, this
can be removed once we have support for multiple solib_ops in a
program_space.

There is also a small change in how rocm_solib_ops is activated.  Prior
to this patch, it's done at the end of rocm_update_solib_list.  Since it
overrides the function pointer in the static svr4_solib_ops, and then
overwrites the host gdbarch, so_ops field, it's something that happens
only once.  After the patch though, we need to set rocm_solib_ops in all
the program spaces that appear.  We do this in
rocm_solib_target_inferior_created and in the new
rocm_solib_target_inferior_execd.  After this, I will explore doing a
change where rocm_solib_ops is only set when we detect the ROCm runtime
is loaded.

Change-Id: I5896b5bcbf8bdb024d67980380feba1ffefaa4c9
Approved-By: Pedro Alves <pedro@palves.net>
2025-06-26 14:08:31 -04:00

265 lines
8.6 KiB
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/* Target-dependent code for the IA-64 for GDB, the GNU debugger.
Copyright (C) 2000-2025 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "extract-store-integer.h"
#include "ia64-tdep.h"
#include "arch-utils.h"
#include "gdbcore.h"
#include "regcache.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "linux-tdep.h"
#include "solib-svr4-linux.h"
#include "regset.h"
#include <ctype.h>
/* The sigtramp code is in a non-readable (executable-only) region
of memory called the ``gate page''. The addresses in question
were determined by examining the system headers. They are
overly generous to allow for different pages sizes. */
#define GATE_AREA_START 0xa000000000000100LL
#define GATE_AREA_END 0xa000000000020000LL
/* Offset to sigcontext structure from frame of handler. */
#define IA64_LINUX_SIGCONTEXT_OFFSET 192
static int
ia64_linux_pc_in_sigtramp (CORE_ADDR pc)
{
return (pc >= (CORE_ADDR) GATE_AREA_START && pc < (CORE_ADDR) GATE_AREA_END);
}
/* IA-64 GNU/Linux specific function which, given a frame address and
a register number, returns the address at which that register may be
found. 0 is returned for registers which aren't stored in the
sigcontext structure. */
static CORE_ADDR
ia64_linux_sigcontext_register_address (struct gdbarch *gdbarch,
CORE_ADDR sp, int regno)
{
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
gdb_byte buf[8];
CORE_ADDR sigcontext_addr = 0;
/* The address of the sigcontext area is found at offset 16 in the
sigframe. */
read_memory (sp + 16, buf, 8);
sigcontext_addr = extract_unsigned_integer (buf, 8, byte_order);
if (IA64_GR0_REGNUM <= regno && regno <= IA64_GR31_REGNUM)
return sigcontext_addr + 200 + 8 * (regno - IA64_GR0_REGNUM);
else if (IA64_BR0_REGNUM <= regno && regno <= IA64_BR7_REGNUM)
return sigcontext_addr + 136 + 8 * (regno - IA64_BR0_REGNUM);
else if (IA64_FR0_REGNUM <= regno && regno <= IA64_FR127_REGNUM)
return sigcontext_addr + 464 + 16 * (regno - IA64_FR0_REGNUM);
else
switch (regno)
{
case IA64_IP_REGNUM :
return sigcontext_addr + 40;
case IA64_CFM_REGNUM :
return sigcontext_addr + 48;
case IA64_PSR_REGNUM :
return sigcontext_addr + 56; /* user mask only */
/* sc_ar_rsc is provided, from which we could compute bspstore, but
I don't think it's worth it. Anyway, if we want it, it's at offset
64. */
case IA64_BSP_REGNUM :
return sigcontext_addr + 72;
case IA64_RNAT_REGNUM :
return sigcontext_addr + 80;
case IA64_CCV_REGNUM :
return sigcontext_addr + 88;
case IA64_UNAT_REGNUM :
return sigcontext_addr + 96;
case IA64_FPSR_REGNUM :
return sigcontext_addr + 104;
case IA64_PFS_REGNUM :
return sigcontext_addr + 112;
case IA64_LC_REGNUM :
return sigcontext_addr + 120;
case IA64_PR_REGNUM :
return sigcontext_addr + 128;
default :
return 0;
}
}
static void
ia64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
ia64_write_pc (regcache, pc);
/* We must be careful with modifying the instruction-pointer: if we
just interrupt a system call, the kernel would ordinarily try to
restart it when we resume the inferior, which typically results
in SIGSEGV or SIGILL. We prevent this by clearing r10, which
will tell the kernel that r8 does NOT contain a valid error code
and hence it will skip system-call restart.
The clearing of r10 is safe as long as ia64_write_pc() is only
called as part of setting up an inferior call. */
regcache_cooked_write_unsigned (regcache, IA64_GR10_REGNUM, 0);
}
/* Implementation of `gdbarch_stap_is_single_operand', as defined in
gdbarch.h. */
static int
ia64_linux_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)
{
return ((isdigit (*s) && s[1] == '[' && s[2] == 'r') /* Displacement. */
|| *s == 'r' /* Register value. */
|| isdigit (*s)); /* Literal number. */
}
/* Core file support. */
static const struct regcache_map_entry ia64_linux_gregmap[] =
{
{ 32, IA64_GR0_REGNUM, 8 }, /* r0 ... r31 */
{ 1, REGCACHE_MAP_SKIP, 8 }, /* FIXME: NAT collection bits? */
{ 1, IA64_PR_REGNUM, 8 },
{ 8, IA64_BR0_REGNUM, 8 }, /* b0 ... b7 */
{ 1, IA64_IP_REGNUM, 8 },
{ 1, IA64_CFM_REGNUM, 8 },
{ 1, IA64_PSR_REGNUM, 8 },
{ 1, IA64_RSC_REGNUM, 8 },
{ 1, IA64_BSP_REGNUM, 8 },
{ 1, IA64_BSPSTORE_REGNUM, 8 },
{ 1, IA64_RNAT_REGNUM, 8 },
{ 1, IA64_CCV_REGNUM, 8 },
{ 1, IA64_UNAT_REGNUM, 8 },
{ 1, IA64_FPSR_REGNUM, 8 },
{ 1, IA64_PFS_REGNUM, 8 },
{ 1, IA64_LC_REGNUM, 8 },
{ 1, IA64_EC_REGNUM, 8 },
{ 0 }
};
/* Size of 'gregset_t', as defined by the Linux kernel. Note that
this is more than actually mapped in the regmap above. */
#define IA64_LINUX_GREGS_SIZE (128 * 8)
static const struct regcache_map_entry ia64_linux_fpregmap[] =
{
{ 128, IA64_FR0_REGNUM, 16 }, /* f0 ... f127 */
{ 0 }
};
#define IA64_LINUX_FPREGS_SIZE (128 * 16)
static void
ia64_linux_supply_fpregset (const struct regset *regset,
struct regcache *regcache,
int regnum, const void *regs, size_t len)
{
const gdb_byte f_one[16] =
{ 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
regcache_supply_regset (regset, regcache, regnum, regs, len);
/* Kernel generated cores have fr1==0 instead of 1.0. Older GDBs
did the same. So ignore whatever might be recorded in fpregset_t
for fr0/fr1 and always supply their expected values. */
if (regnum == -1 || regnum == IA64_FR0_REGNUM)
regcache->raw_supply_zeroed (IA64_FR0_REGNUM);
if (regnum == -1 || regnum == IA64_FR1_REGNUM)
regcache->raw_supply (IA64_FR1_REGNUM, f_one);
}
static const struct regset ia64_linux_gregset =
{
ia64_linux_gregmap,
regcache_supply_regset, regcache_collect_regset
};
static const struct regset ia64_linux_fpregset =
{
ia64_linux_fpregmap,
ia64_linux_supply_fpregset, regcache_collect_regset
};
static void
ia64_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
iterate_over_regset_sections_cb *cb,
void *cb_data,
const struct regcache *regcache)
{
cb (".reg", IA64_LINUX_GREGS_SIZE, IA64_LINUX_GREGS_SIZE, &ia64_linux_gregset,
NULL, cb_data);
cb (".reg2", IA64_LINUX_FPREGS_SIZE, IA64_LINUX_FPREGS_SIZE,
&ia64_linux_fpregset, NULL, cb_data);
}
static void
ia64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
ia64_gdbarch_tdep *tdep = gdbarch_tdep<ia64_gdbarch_tdep> (gdbarch);
static const char *const stap_register_prefixes[] = { "r", NULL };
static const char *const stap_register_indirection_prefixes[] = { "[",
NULL };
static const char *const stap_register_indirection_suffixes[] = { "]",
NULL };
linux_init_abi (info, gdbarch, 0);
/* Set the method of obtaining the sigcontext addresses at which
registers are saved. */
tdep->sigcontext_register_address = ia64_linux_sigcontext_register_address;
/* Set the pc_in_sigtramp method. */
tdep->pc_in_sigtramp = ia64_linux_pc_in_sigtramp;
set_gdbarch_write_pc (gdbarch, ia64_linux_write_pc);
set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_solib_svr4_ops (gdbarch, make_linux_lp64_svr4_solib_ops);
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);
/* Core file support. */
set_gdbarch_iterate_over_regset_sections
(gdbarch, ia64_linux_iterate_over_regset_sections);
/* SystemTap related. */
set_gdbarch_stap_register_prefixes (gdbarch, stap_register_prefixes);
set_gdbarch_stap_register_indirection_prefixes (gdbarch,
stap_register_indirection_prefixes);
set_gdbarch_stap_register_indirection_suffixes (gdbarch,
stap_register_indirection_suffixes);
set_gdbarch_stap_gdb_register_prefix (gdbarch, "r");
set_gdbarch_stap_is_single_operand (gdbarch,
ia64_linux_stap_is_single_operand);
}
INIT_GDB_FILE (ia64_linux_tdep)
{
gdbarch_register_osabi (bfd_arch_ia64, 0, GDB_OSABI_LINUX,
ia64_linux_init_abi);
}
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